.hide{
    display: none;
}

.center{
    display: inline-block;
    position: relative;
    vertical-align: middle;

    & + span{
        display: inline-block;
        vertical-align: middle;
        height: 100%;
    }
}

.clearfix {
    zoom:1;
    &:before, &:after {
        content: "\0020";
        display: block;
        height: 0;
        overflow: hidden;
    }
    &:after {
        clear: both;
    }
}

.wrapper{
    margin: 0 auto;
    max-width: 1000px;
}